Chapter 8: Aggregation of Reserves and Resources

In reserves and resources assessment, technically recoverable quantities are typically based on the results of analog analyses, performance evaluations, and/or volumetric calculations for individual wells, reservoirs, or portions of reservoirs. These estimates may be combined to arrive at recoverable quantities for fields, properties, projects, and portfolios. The uncertainty of the combined estimates at each of these levels may differ greatly, depending on such factors as geological setting and maturity of the resource. This cumulative process, which takes into account the uncertainty, is referred to as “aggregation.” Appropriate aggregation methods enable efficient decision and valuation assessments for both conventional and unconventional assets.